公开(公告)号：US20210188715A1

公开(公告)日：2021-06-24

申请号：US17036801

申请日：2020-09-29

Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

Inventor： Sheng-Min YU ,  Sheng-Yi CHIU ,  Chien-Chung HSU

IPC: C04B35/553 ,  C02F1/28

Abstract: A method of removing fluoride ion from waste liquid is provided, which includes providing a calcium source and a plurality of ceramic particles to a waste liquid containing fluoride ion for forming a plurality of calcium fluoride layers wrapping the ceramic particles. The calcium fluoride layers are connected to form a calcium fluoride bulk. The ceramic particles are embedded in the calcium fluoride bulk. The ceramic particles and the calcium fluoride bulk have a weight ratio of 1:4 to 1:20.